a(n+1) = a(n) + floor(a(n)/6) with a(0) = 6.

Terms

a(0) =6a(1) =7a(2) =8a(3) =9a(4) =10a(5) =11a(6) =12a(7) =14a(8) =16a(9) =18a(10) =21a(11) =24a(12) =28a(13) =32a(14) =37a(15) =43a(16) =50a(17) =58a(18) =67a(19) =78a(20) =91a(21) =106a(22) =123a(23) =143a(24) =166a(25) =193a(26) =225a(27) =262a(28) =305a(29) =355